Hello,
I have recently done my assessment with ACS and emailed them myself with the queries I had before submitting. They replied promptly and are very professional.
You are right though, they do list the CCNA as an example qualification under the ANZSCO code for a Web Admin but do not specify it in the list of qualifications they would compare to an AQF Diploma. The list can be found here https://www.acs.org.au/__data/assets/pdf_file/0016/7324/Summary-of-Criteria.pdf
When I did my assessment, I had to give them access to my Microsoft transcript to verify my qualifications so you need to do the same for your Cisco certs.
Just send them an email and double check to see if CCNA is accepted and whether it would be accepted if expired.